Using a fork poke holes in both sides of each potato. Microwave on high heat for 2 minutes. Turn and microwave another 2 minutes until almost cooked through. Let cool. Alternately boil the potatoes.
Peel potatoes if desired. Cut into even pieces the size you like.
Heat oil and butter in large skillet over medium-high heat. Add potatoes spreading them evenly on the bottom of the pan. Let them sit for 3-4 minutes to develop a golden crust on the bottom. Repeat this method stirring every few minutes to cook the potatoes until crispy on all sides. Transfer potatoes to a bowl and set aside.*
In a separate pan sauté whole sausages until browned on all sides. Remove sausage to cutting board and cut in half lengthwise. Return to the pan and sauté until cooked. Remove from pan and cut into chucks. Add to the potatoes.
Add more oil and butter as needed.
Add onion and red pepper to the pan and sauté until cooked, about 10 minutes.
Add potato-sausage mixture and stir to combine and reheat.
Salt and pepper to taste. Garnish with parsley if desired. Serve hot.
Notes
*You can cook the potatoes and sausage in the pan together. I was going for a nice photo so I did them separately.